High aperture objective of the extended gauss-type

ABSTRACT

High aperture objective of the extended Gauss-type, made up of six components, having a relative aperture of at least f/1 and an angular field of 2 omega of at least 40*.

United State Vuijk HIGH APERTURE OBJECTIVE OF THE EXTENDED GAUSS-TYPE [75] Inventor: Pieter Vuijk,Naaldwijk,

Netherlands [73] Assignee: N.V. Optische Industrie De Oude Delft" Van Miereveltlaan, Delft, Netherlands 22 Filed: Dec. 8, 1972 21 App1.No.:3l3,330

[30] Foreign Application Priority Data Jan. 31. 1972 Netherlands 7201267 [52] US. Cl. 350/215, 350/176 [51] Int. Cl. G021) 9/62 [58] Field Of Search 350/214, 215, 176, 177,

.. [451 Apr. 9, 1974 [56] References Cited UNITED STATES PATENTS 3.504.961 4/1970 Hoogland et a1. 350/215 X 3.357.776 12/1967 Becker 350/218 X 3.472.576 10/1969 Wagner... 350/176 Primary ExaminerJohn K. Corbin Attorney, Agent. or Firm-Arthur B. Colvin [57] ABSTRACT High aperture objective of the extended Gauss-type.

' made up of six components. having a relative aperture of at least f/ 1 and an angular field of 2w of at least 40.

4 Claims, 10 Drawing Figures in 11 12 13 11/15 is HIGH APERTURE OBJECTIVE OF THE EXTENDED GAUSS-TYPE which, taken in the order from the long conjugate towards the short conjugate of the objective, consists of a first (L and a second (L component, which components each consist of a single meniscus lens of posi-.

tive power turned with its concave side to the diaphragm, a third (L and L.) and a fourth (L and L component, which components each consist of a divergent cemented doublet meniscus component each turned with its concave side to a diaphgram, which is placed between the third and fourth components and a fifth (L component, which component consists of a lens of positive power.

Objectives of this type have been described in the Dutch Pat. specification No. 121,686. This objective has a relative aperture of f/0.95 and iswell corrected in an angular field of 40. It appears that the state of correction of an objective of this type can no further be improved if the relative aperture is increased. In particular the astigmatism can not be surpressed sufficiently.

The object of the invention is to provide an objective with an improved relative aperture and a good state of correction in an angular field of at least 40.

The object according to'the invention is characterized by a sixth (L L and L component which component is placed behind the fifth component and is made up of a divergent meniscus component of small power and of which the convex side is turned towards the diaphragm, the thickness of this component being larger than 0.3f, and by the following conditions in combination:

in which n,,,,,,,,.,,,, is the refractive index for the d-line of the spectrum of the lenses in the order indicated above.

The conditions indicated above while allowing to increase considerably the relative aperture of the objective, appear to be especially effective to provide a good state of correction, whereas the first condition has a particularly favorable influence on the correction of astigmatism.

1n the embodiments, which will be described hereafter, the sixth component is made up of three lenses (L L, and L It is. however, noted that, dependent on the spectrum, which is used and/or the state of correction required, this number may be one or two.

F 1G. 1 illustrates the three embodiments of the objective according to the invention.

FIGS. 2-4 show the spherical aberration and the unsatisfied amount of the sine condition, the astigmatism and the distortion, respectively for a first embodiment with a relative aperture of f7 1 and an angular field of 54.

FIGS. 5-7 show the corresponding aberrations for a second embodiment with a relative aperture of fl 0.87

and an angular field of 45.

Tables 1, 11 and 111. In these tables the lenses are indicated as L,,,,,,,,.,.,,,, and the diaphgram with D.

TABLE 1 radius of lens thickness curvature or distance TABLE 11 radius of lens thickness curvature or distance d, 0.0052 r, +1.030l

d 0.3694 r. O.5306

TABLE 111 radius of lens thickness curvature or distance refractive Abbe index number field 40 refractive Abbe index number r, =+1.6359 L, d.=0.0413 n 1.6885 30.6 L d, 0.1512 n. 1.6405 v, 60.1 r, +0.3603

r, +4.41s9 I 1) d, 0.3474

4, 0.0056 r, -0.4916 r, +1.2091 L, 4.. 0.0443 .n, 1.699011, 30.1 L, d,=0.1456 11, 1.6405u,=60.1 r,=+l.4506

r, +2.3669 L, d. 0.2009 n, 47.4

d. =0.0056 r 0.6609 r, +0.6978 4,, 0.0049 L, d,=0.2331 n,= l.8028u, 46.8 r =+1.1770 4 L, 71., 0.2055 n-, 1.7883 1 r, =+1.6877 r,,=3.3233

d. 0.0350 n. 1.6885 11 m 8., 0.0049 r, +0.4311 m r +3.2477 D d,=0.4123 1., d,,=0.064l n,= 1.5488 u,=45.4

0.5911 r +0.8064 L, a, 0.0364 n, 1.699011, 30.1 L, 71,. 0.2719 n, 1.7883 v, 47.4

r, =+1.4037 r,,=2.1956 L, d, 0.2412 n, l.8028 v, 46.8 L", 81., 0.0493 1.784711 25.8

d 0.0056 +1.7441 r +1.0157 L d 0.2748 n 1.7885 50.5

1 3.956i 1 3. High aperture ob ectlve according to cla1m 1,

+1 2-: 00056 characterized by the following numeral data: '1: L. 71., 0.0728 n, =1.5234v, 51.5 a

r 77 4 f= 1.0 f/0.87 field 45 L. d" 0.2913 73g3 I, 47 4 radius of lens thickness refractive Abbe r, 0.9938 curvature or distance index number L, 11,, 0.0532 1.784711 25.8 r

' r, +1.9217 =+o993g L, d 0.0996 n,= l.l730v,=53.8

a d 0.0052 What I cla1m 1s: r, +1.0301 1. High aperture objective of the extended Gauss- LI +2 g== -l3 0 n,= 1.7130 v,=53.8

r type w1th a relat1ve aperture of at least f/ l and an angu- Q0052 lar field of 20: of at least 40, wh1ch, taken 1n the order '8 I 8028 46 8 from the long conjugate towards the short conjugate of h 02073 the objective, consists of a first (L,) and a second (L 1.. d, 0.0445 n. 1.6885 11, 30.6 component, which compohents each consist of a single D +0382: 0 3694 1 meniscus lens of pos1t1ve power turned w1th 1ts concave r, -0.5306 3 side to the diaphragm, a third (L and L and a fourth L4 H 10472 L699) 301 I (L and L component, which components each con- HMS "I 1,8028 sist of a divergent cemented doublet meniscus compoy m i 0 0052 nent, each turned with its concave side to a diaphgram H which is placed between the third and fourth compo- 1.7 d =0.2186 n-,= 1.7885 v-,= 50.5v nents and a fifth (L component, which component 0 0052 8 4 6 I cons1sts of a lens of pos1t1ve power, characterlzed by 2.9298 a sixth divergent meniscus component (L,,, L L of 40 r =+O small power which is placed behind the fifth compo- L d 03386 1 7g44 =43 9 nent and of wh1ch the convex s1de 1s turned toward the L m 2- 5 0 0524 I 7847 25 8 diaphragm, said sixth component consisting of a first divergent meniscus lens (L 21 second lens (L of posr 1.4398 itive power and a third divergent biconcave lens (L 45 the thickness of the sixth component being greater than 4- H1gh aperture ob ective accordmg to 01am 1, 0.3f, and by the following conditions characterized by the followmg numeral data:

n 1.75 n n f= 1.0' 00.75 11610 40 3 4 radius of lens thickness refractive Abbe n 1.75 curvature or distance index number n l.75 d r. +1.63s9 1n wh1ch n 1s the refractwe 1ndex for the d-lme of 01512 "I 405 601 the spectrum of the lenses in the order indicated above. 0 0056 I r, +1.2091 2. Hlgh aperture ObjCCtlVC accordmg to clalm 1, L, 2 36 d3 0.1456 n, 1.6405 9, 60.1

3 r 69 charactenzed by the following numeral data. d 00056 I, +0.6978 f= 1.0 [/10 field 54 L, d, 0.2331 n, 1.8028 v, 46.8

radius of lens thickness refractive Abbe r. +1.6877 curvature or distance index number L. d. 0.0350 n l.6885 v, 30.6

r d n v r,=+0.43ll r =+1.6277 D d,=0.4123 L d,=0.l035 r1 l.7l30v =53.8 r,=0.5911

r, +3.1014 L, a. 0.0364 n, 1.6990 v, 30.1

d, 0.0054 r, +1 4037 r, +1.2825 L, d, 0.2412 n. 1.8028 6. 46.8 L, d,= 0.0951 n,=1.7130v,= 53.8 r..=0.8500

. d.=0.0106 r,.-+10157 r, +0.5583 L, a 0.2748 n, 1.7885 v 50.5 L, d,= 0.1939 n,= 1.7883 u,=47.4 r,,=3.9562 

2. High aperture objective according to claim 1, characterized by the following numeral data: f 1.0 f/1.0 field 54*radius of lens thickness refractive Abbe curvature or distance index number r d nd Nu r1 +1.6277 L1 d1 0.1035 n1 1.7130 Nu 1 53.8 r2 +3.1014 d2 0.0054 r3 +1.2825 L2 d3 0.0951 n2 1.7130 Nu 2 53.8 r4 +2.5588 d4 0.0106 r5 +0.5583 L3 d5 0.1939 n3 1.7883 Nu 3 47.4 r6 +1.4844 L4 d6 0.0413 n4 1.6885 Nu 4 30.6 r7 +0.3603 D d7 0.3474 r8 -0.4916 L5 d8 0.0443 n5 1.6990 Nu 5 30.1 r9 +1.4506 L6 d9 0.2009 n6 1.7883 Nu 6 47.4 r10 -0.6609 d10 0.0049 r11 +1.1770 L7 d11 0.2055 n7 1.7883 Nu 7 47.4 r12 -3.3233 d12 0.0049 r13 +3.2477 L8 d13 0.0641 n8 1.5488 Nu 8 45.4 r14 +0.8064 L9 d14 0.2719 n9 1.7883 Nu 9 47.4 r15 -2.1956 L10 d15 0.0493 n10 1.7847 Nu 10 25.8 r16 +1.7441
 3. High aperture objective according to claim 1, characterized by the following numeral data: f 1.0 f/0.87 field 45*radius of lens thickness refractive Abbe curvature or distance index number r d nd Nu r1 +1.9217 L1 d1 0.0996 n1 1.1730 Nu 1 53.8 r2 +4.0162 d2 0.0052 r3 +1.0301 L2 d3 0.1310 n2 1.7130 Nu 2 53.8 r4 +2.0173 d4 0.0052 r5 +0.6367 L3 d5 0.2073 n3 1.8028 Nu 3 46.8 r6 +1.5787L4 d6 0.0445 n4 1.6885 Nu 4 30.6 r7 +0.3825 D d7 0.3694 r8 -0.5306 L5 d8 0.0472 n5 1.6990 Nu 5 30.1 r9 +1.5428 L6 d9 0.2145 n6 1.8028 Nu 6 46.8 r10 -0.7233 d10 0.0052 r11 +1.0657 L7 d11 0.2186 n7 1.7885 Nu 7 50.5 r12 -3.4390 d12 0.0052 r13 + 2.9298 L8 d13 0.0681 n8 1.5488 Nu 8 45.4 r14 +0.7651 L9 d14 0.2886 n9 1.7844 Nu 9 43.9 r15 -2.812 L10 d15 0.0524 n10 1.7847 Nu 10 25.8 r16 -1.4398
 4. High aperture objective according to claim 1, characterized by the following numeral data: f 1.0 f/0.75 field 40*radius of lens thickness refractive Abbe curvature or distance index number r d nd Nu r1 +1.6359 L1 d1 0.1512 n1 1.6405 Nu 1 60.1 r2 +4.4159 d2 0.0056 r3 +1.2091 L2 d3 0.1456 n2 1.6405 Nu 2 60.1 r4 +2.3669 d4 0.0056 r5 +0.6978 L3 d5 0.2331 n3 1.8028 Nu 3 46.8 r6 +1.6877 L4 d6 0.0350 n4 1.6885 Nu 4 30.6 r7 +0.4311 D d7 0.4123 r8 -0.5911 L5 d8 0.0364 n5 1.6990 Nu 5 30.1 r9 +1.4037 L6 d9 0.2412 n6 1.8028 Nu 6 46.8 r10 -0.8500 d10 0.0056 r11 +1.0157 L7 d11 0.2748 n7 1.7885 Nu 7 50.5 r12 -3.9562 d12 0.0056 r13 +1.3406 L8 d13 0.0728 n8 1.5234 Nu 8 51.5 r14 +0.7714 L9 d14 0.2913 n9 1.7883 Nu 9 47.4 r15 -0.9938 L10 d15 0.0532 n10 1.7847 Nu 10 25.8 r16 +0.9938 